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Draw to lines in your notebook line the ones below. What is true about the lines?
THEY ARE PARALLEL. MARK THEM.
Draw a transversal. A transversal is a line that intersects two other lines.
Label the intersection points A & B.
Draw another transversal that intersects B.
What angles are equal in this picture? You do not have to write this down.
Write this down. 1 5 since they are corresponding angles.
Draw another transversal that intersect point B. What is a transversal again?
Which angle is congruent to 9? Why?
Which angle is congruent to 9? Why?
9 11 since they are corresponding angles. Write this down.
9 11 since they are corresponding angles. Mark this in your diagram.
Are there other angles that are congruent?
15 16 because they are vertical angles.
What does this justify or prove? NCTMNCTM
THE SUM OF THE ANGLES IN A TRIANGLE ADD TO 180
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